Wheel dressing device



1951 LA VERN M. BARGREN WHEEL DRESSING DEVICE Filed July 28, 1948 INVEN TOR. L694 A TTOHNE Y5 Patentecl Aug. 21, 1951 UNITED STATES PATENT OFFICE 2,565,013 WHEEL DRESSING DEVICE La Vern M. Bargren, Rockford, 111. assignor to Barber-Colman Company, Rockford, 111., a corporation of Illinois Application I Iu ly 28, 1948, Serial N 0. 41,151

4 Claims.

This inve tion relates to a device for supporting a dressing tool for movement back and forth across the face of a grinding wheel to dress the face to a desired contour.

The primary object is to provide a dressing device in which the tool is movable through a hired range which is bodily shiftabl'e in the direetion of the dressing motion so as 'to compensate for wearing "off of the wheel face.

The invention also resides in the novel and s'irn'ple character of the construction which contributes to overall compactness and facilitates ad- Justm'en'tto adapt the device to the changing size of the grinding wheel.

Other objects and advantages of the invention will become apparent from the following detailed description taken in connection with the accompanting drawings, in which:

Figure 1 is a fragmentary "side view of a grinding machine equipped with the improved dressin'g device which is shown in "Vertical section.

d Fig. 2 'is a fragmentary section taken along the line 2-2 of Fig. '1.

Fig. 3 is a fragmentary section taken along the line -3-3 'O'f Fig.2.

While the invention is susceptible of various modifications and alternative constructions, I

have shown in the drawings and will herein "describe in detail the preferred embodiment. It is to he understood, however, that I do not intend to limit the invention "by such disclosure but aim to cover 'a11 'mOdifiCatl'0liS and alterna- "tive constructions fallin Within the spirit and scope of the invention as expressed in the appended claims.

In the form shown in the drawings for purposes of illustration, the improved dressing de- "vice is 'bu'iltinto a grinding machine and adapted to dress the frustoco'nical peripheral face In of a wheel ll fixed to a'rotary spindle I2 which is journaled in an axiallyadjustablesleeve I3. Such adjustment "is effectedt'hr'ough ayworm and wheel l4 and a rack and pinion [5 in response to manual turning of a knob "I B. By such adjustment, the active surface of the wheel may be maintained in proper position relative to the "work as "the wheel wears down to "the size shown in iphanto'min Fig. l.

The dressing "tool or diamond point l! is "clamped fin the bar i=8 by a clamping 'screw "I9 which pulls "the split end together. In the present instance, dressing of the'wheelface is effected by 'a'reeiprocatory movement of the tool. 'For'this .Ipurp'o'se, "the bar projects finto and is slida'bly guided by a sleeve "20 'whichis in 'turnslfdable in a guide sleeve 21 mounted in the proper position in an extension '22 of th grinding machine frame. A longitudinally extending slot 23 is formed in the under side of the sleeve 24 to receive a stop 24 which cooperates with the ends of the slot to positively limit the range of reciprocation of the sleeve and, as will appear later, the range of movement of the tool H. The stop projects into a groove '25 in the bar is and thus holds the latter against turning within the sleeve while permitting adjustment of the bar endwise relative to the sleeve. A flexible and extensible diaphragm so is stretched between flanges on the lower ends or" the sleeves 29 and 21 and urges the former inwardly relative to the guide sleeve.

On the upper side, the guide sleeve 2| is slotted longitudinally to receive one side of a. gear sagment 29 fast on one end of a tubular rockshaft or tube El journaled in the hearing 28 on the frame extension 2 2. This shaft is keyed'a't 29 to a disk 30 with which a handle 3! is rigid and projects upwardly. A contractile spring 32 'ac'ts on an arm 33 on the sleeve 2'! to urge the latter and the handle clockwise toward the normal retracted position shown in Fig. 1.

Extending through the tubular shaft and journaled in the latter and in a bearing 34 is a shaft 35 which is fixed to the hub of a gear segment 36 disposed adjacent the gear 23 and projecting through the slot in the guide sleeve and also through a slot in the sleeve 2! The teeth on the two segments 26 and 3% are of the same pitch and mesh respectively with rack teeth 37 and '38 formed on the sleeve 20 and on the rack bar I8.

"Provision is made for normally locking the gear 26 and 36 together for turning in :unison while permitting of disengagementof the coupling to allow for relative angular ad-j ustnient-between-the gears and, therefore, changing the retracted position of the dressing point H. In the present in stance, this coupling isoi the yieldahle type and formed 'by a-detent 4! whose inner taperedend 46 is adapted to enter tapered notchesbetween teeth 42 formed in the'outer face of the disk 38 and angularly spaced and extending partly around "the latter. The detent is slidable in a "recess 44 in a disk or'knob pinned to the shaft {35 adjacent th disk 33. A compression spring '43 "urges the detent into engagement with the teeth "42 with a force determined bythe adjustment of a setscrew'45.

With the end of the detent seated 'in-one-'0f the notches on the'disk '30, the *twodis'ks and,

therefore, the gears'26 and 36 will be'co'upled toto the sleeve 20. This is accomplished by manually turning the knob 41 while the handle 31 is held against turning. When sufficient torque is thus applied to the knob, the detent will be cammed out of one of the notches and advanced to a succeeding notch, the bar [8 being advanced correspondingly. The extent of such relative adjustment between the bar l8 and the sleeve 20 may be sensed readily by th operator as the detent rides over the successive teeth 42. The range of such adjustment is limited by the length of an arcuate slot 49 in the disk 30 receiving a pin 50 which is fixed to the knob 41.

When the wheel II is new, and therefore of maximum diameter, the mechanism above described is adjusted to locate the dressing point in th position shown in full in Fig. l, the handle 3| then being released. Such positioning is achieved by turning the knob 41 counterclockwise and slipping the detent clutch until the pin 50 comes against the end of the slot 49 as shown in Fig. 3. The dressing tool is then adjusted relative to the bar [8 to bring its point against a locating finger 5!.

To dress the wheel face, the handl 3| is turned counterclockwise, thereby advancing the sleeve 20 and the bar I8 in unison until the end of the sleeve slot 23 encounters the stopit. In this movement, the point H is passed across the wheel face It through a range a and to a position only slightly beyond the inner edge of the wheel face. As the handle is released, the tool is drawn back across the wheel face by the action of the spring 32.

As the wheel wears and is dressed down to a smaller diameter, it is retracted axially by adjustment of the knob [6. Then it becomes desirable to shift the range of reciprocation of the dressing tool so that the tool in its opposite limit positions is disposed close to but outwardly from th opposite margins of the wheel face II). To effect this adjustment, the handle 3| is held in retracted position, and the knob 41 is manually turned clockwise to slip the detent coupling and advance the tool [1 to a position close to the outer end of the wheel face.

Such adjustment of the range of reciprocation of the dressing tool is effected intermittently throughout the life of the wheel until finally the wheel IE] will be sized and positioned as shown in phantom in Fig. 1. At this time, the knob 41 will have been turned throughout the length of the slot 49, and the mechanism will then be conditioned to reciprocate the tool through the range b. Then, when in its advanced position, the tool will be disposed as shown in phantom in Fig. 1.

By adjusting the range of reciprocation of the tool to correspond to the changing position of the wheel face, the dressing operations are greatly facilitated and the time consumed in dressing the wheel is minimized. This is because the tool engages the wheel face immediately in response to movement of the handle and substantially throughout the range of movement of the latter. For the same reason, the over-all dimensions of ,the dressing device as a whole are reduced to 4. a minimum. By making the coupling between the gears 26 and 3B disengageable in response to the transmission of a predetermined torque therethrough, the coupling also serves as a safety device to prevent damage to the wheel in the event that the latter is inadvertently adjusted to a position to interfere with the advance of the dressing tool.

I claim as my invention:

1. In a wheel dresser, the combination of, a sleeve mounted for endwise reciprocation through a fixed range, a rack bar slidable in and endwise of said sleeve with one and projecting from the sleeve and adapted for attachment of a dressing tool thereto, said sleeve being slotted longitudinally to expose the teeth of said rack bar and having rack teeth paralleling the bar teeth, first and second gears respectively meshing with teeth of said sleeve and bar, a second sleeve fixed to said first gear and urged in a direction to retract said bar, a handle fixed to said second sleeve, a shaft journaled in said second sleeve and fixed to said second gear, and a coupling having elements on said second sleeve and said shaft, one or" said elements having angularly spaced tapered notches therein, and a detent on the other coupling element having a tapered end spring urged into one of said notches but retractible therefrom to permit of relative angular adjustment between said gears.

2. In a wheel dresser, the combination of, a sleeve mounted for endwise reciprocation through a fixed range, a rack bar slidable in and endwise of said sleeve with one end projecting from the sleeve and adapted for attachment of a dressing tool thereto, said sleeve being slotted longitudinally to expose the teeth 01 said rack and having rack teeth extending along the latter, first and second gears respectively meshing with the teeth of said sleeve and bar, a second sleeve fixed to said first gear and urged in a direction to retract said bar, a handle fixed to said second sleeve, a shaft journaled in said second sleeve and keyed to said second gear, and a coupling having elements on said second sleeve and said shaft normally engaged to hold said gears against turning relative to each other but disengageable to permit of relative angular adjustment of said gears.

3. In a wheel dresser, the combination of, a sleeve mounted for endwise reciprocation through a fixed range, a rack bar slidable in and endwise of said sleeve with one end projecting from the sleeve and adapted for attachment of a dressing tool thereto, said sleeve having rack teeth formed therealong and being slotted to expose the teeth of said rack, first and second gears respectively meshing with the teeth of said sleeve and bar, a handle rigid with said first gear, a coupling normally connecting said gears to turn in unison but adapted to permit relative angular adjustment between the two, and stop elements movable with the respective parts of said coupling and interengageable with cac other to limit the range of such angular adjustment between said gears.

4. In a wheel dresser, the combination of, a sleeve mounted for endwise reciprocation through a fixed range, a rack bar slidable in and endwise of said sleeve with one end projecting from the sleeve and adapted for attachment of a dressing tool thereto, said sleeve having rack teeth formed therealong and being slotted to expose the teeth of said rack, first and second gears respectively meshing with the teeth of said sleeve and bar, a handle rigid with said first gear, and coupling elements normally yieldably urged into interengagement to provide a drive connection between said gears, said elements being disengageable in response to a predetermined torque manually applied to one element whereby to permit of angular adjustment of said gears.

LA VERN M. BARGREN.

REFERENCES CITED The following references are of record in the file of this patent:

Number 6 UNITED STATES PATENTS Name Date Villeneuve Oct. 24, 1911 FOREIGN PATENTS Country Date France Feb. 24, 1905 Great Britain Nov. 15, 1939 

